There is no such thing as holes
it's just a missing electron.
So a hole current is an electron current going the opposite way.
But you could try to get the separated currents by doing a manual integration of the transmission spectrum - the formula for how to get the current from the transmission is given in the
reference manual, so you can just sum it up over the relevant energy interval as a simple approximation, instead of over the entire bias window as the method "current()" does.
